Fix accessing name on jsdoc link for invalid names

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

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This section details on the original issue you should resolve

<issue_title>[7.0 API] - Accessing name on a jsdoc link that does not have a valid name produces sibling node</issue_title>
<issue_description>### 🔎 Search Terms

jsdoc link name

🕗 Version & Regression Information

• This changed between versions 6 and 7

⏯ Playground Link

Playground Link

💻 Code

/**
* {@link #toggled} property
*/
export const x = 1;

🙁 Actual behavior

Using the TS API to get the name jsdoc link tag produces node containing JSDocText property (the next sibling node)

import { API } from "@typescript/native-preview/unstable/sync";
import { createVirtualFileSystem } from "@typescript/native-preview/unstable/fs";

const code = `/**
* {@link #toggled} property
*/
export const x = 1;`;

const api = new API({
  fs: createVirtualFileSystem({
    "/tsconfig.json": "{}",
    "/src/sample.ts": code,
  }),
});

const snapshot = api.updateSnapshot({ openProject: "/tsconfig.json" });
const project = snapshot.getProject("/tsconfig.json")!;
const sourceFile = project.program.getSourceFile("/src/sample.ts")!;
const statement = sourceFile.statements[0];

// Should be undefined. Returns `property`
console.log(statement.jsDoc[0].comment[1].name?.getText())

🙂 Expected behavior

The name property of the link should be undefined as in 6.0

import ts from "typescript";

const code = `/**
     * {@link #toggled} property
     */
    export const x = 1;`;

const file = ts.createSourceFile("sample.ts", code, ts.ScriptTarget.Latest, true);
const statement = file.statements[0];

// undefined, since #toggle is  not a valid entity name
console.log(statement.jsDoc[0].comment[1].name?.getText());

Additional information about the issue

No response</issue_description>

• Closes [7.0 API] - Accessing name on a jsdoc link that does not have a valid name produces sibling node #63757

Comments on the Issue (you are Copilot in this section)

• Fixes [7.0 API] - Accessing name on a jsdoc link that does not have a valid name produces sibling node #63757

[Andrew Branch (andrewbranch)]

Copilot what are you doing. no time to waste. hop to it please

[Andrew Branch (andrewbranch)]

Copilot yesterday was not your day. today is a new one full of possibility

[Copilot]

Pull request overview

Fixes invalid JSDoc links exposing a sibling node as their name.

Changes:

• Guard child lookup when a remote node has no children.
• Add regression coverage for invalid JSDoc link names.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
tools/scripts/tsc/generate-encoder.ts	Updates generated remote-node logic.
packages/typescript/src/api/node/node.generated.ts	Prevents invalid child lookup.
packages/typescript/test/sync/ast.test.ts	Adds API regression coverage.

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